<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>注释</title>
</head>
<body>
<script type="text/javascript">
    //单行注释 Ctrl+/
    // var num1 = 100;
    //多行注释 Ctrl+Shift+/
/*
    var num1 = 100;
    var num2 = 200;
*/
</script>
</body>
</html>